return NT_STATUS_INTERNAL_ERROR;
}
-
-
-/*********************************************************************
- * the following is a generic validation mechanism for tdbs.
- *********************************************************************/
-
-/*
- * internal validation function, executed by the child.
- */
-static int tdb_validate_child(struct tdb_context *tdb,
- tdb_validate_data_func validate_fn)
-{
- int ret = 1;
- int num_entries = 0;
- struct tdb_validation_status v_status;
-
- v_status.tdb_error = False;
- v_status.bad_freelist = False;
- v_status.bad_entry = False;
- v_status.unknown_key = False;
- v_status.success = True;
-
- if (!tdb) {
- v_status.tdb_error = True;
- v_status.success = False;
- goto out;
- }
-
- /* Check if the tdb's freelist is good. */
- if (tdb_validate_freelist(tdb, &num_entries) == -1) {
- v_status.bad_freelist = True;
- v_status.success = False;
- goto out;
- }
-
- DEBUG(10,("tdb_validate_child: tdb %s freelist has %d entries\n",
- tdb_name(tdb), num_entries));
-
- /* Now traverse the tdb to validate it. */
- num_entries = tdb_traverse(tdb, validate_fn, (void *)&v_status);
- if (!v_status.success) {
- goto out;
- } else if (num_entries == -1) {
- v_status.tdb_error = True;
- v_status.success = False;
- goto out;
- }
-
- DEBUG(10,("tdb_validate_child: tdb %s is good with %d entries\n",
- tdb_name(tdb), num_entries));
- ret = 0; /* Cache is good. */
-
-out:
- DEBUG(10, ("tdb_validate_child: summary of validation status:\n"));
- DEBUGADD(10,(" * tdb error: %s\n", v_status.tdb_error ? "yes" : "no"));
- DEBUGADD(10,(" * bad freelist: %s\n",v_status.bad_freelist?"yes":"no"));
- DEBUGADD(10,(" * bad entry: %s\n", v_status.bad_entry ? "yes" : "no"));
- DEBUGADD(10,(" * unknown key: %s\n", v_status.unknown_key?"yes":"no"));
- DEBUGADD(10,(" => overall success: %s\n", v_status.success?"yes":"no"));
-
- return ret;
-}
-
-/*
- * tdb validation function.
- * returns 0 if tdb is ok, != 0 if it isn't.
- * this function expects an opened tdb.
- */
-int tdb_validate(struct tdb_context *tdb, tdb_validate_data_func validate_fn)
-{
- pid_t child_pid = -1;
- int child_status = 0;
- int wait_pid = 0;
- int ret = 1;
-
- if (tdb == NULL) {
- DEBUG(1, ("Error: tdb_validate called with tdb == NULL\n"));
- return ret;
- }
-
- DEBUG(5, ("tdb_validate called for tdb '%s'\n", tdb_name(tdb)));
-
- /* fork and let the child do the validation.
- * benefit: no need to twist signal handlers and panic functions.
- * just let the child panic. we catch the signal. */
-
- DEBUG(10, ("tdb_validate: forking to let child do validation.\n"));
- child_pid = sys_fork();
- if (child_pid == 0) {
- /* child code */
- DEBUG(10, ("tdb_validate (validation child): created\n"));
- DEBUG(10, ("tdb_validate (validation child): "
- "calling tdb_validate_child\n"));
- exit(tdb_validate_child(tdb, validate_fn));
- }
- else if (child_pid < 0) {
- DEBUG(1, ("tdb_validate: fork for validation failed.\n"));
- goto done;
- }
-
- /* parent */
-
- DEBUG(10, ("tdb_validate: fork succeeded, child PID = %d\n",child_pid));
-
- DEBUG(10, ("tdb_validate: waiting for child to finish...\n"));
- while ((wait_pid = sys_waitpid(child_pid, &child_status, 0)) < 0) {
- if (errno == EINTR) {
- DEBUG(10, ("tdb_validate: got signal during waitpid, "
- "retrying\n"));
- errno = 0;
- continue;
- }
- DEBUG(1, ("tdb_validate: waitpid failed with error '%s'.\n",
- strerror(errno)));
- goto done;
- }
- if (wait_pid != child_pid) {
- DEBUG(1, ("tdb_validate: waitpid returned pid %d, "
- "but %d was expected\n", wait_pid, child_pid));
- goto done;
- }
-
- DEBUG(10, ("tdb_validate: validating child returned.\n"));
- if (WIFEXITED(child_status)) {
- DEBUG(10, ("tdb_validate: child exited, code %d.\n",
- WEXITSTATUS(child_status)));
- ret = WEXITSTATUS(child_status);
- }
- if (WIFSIGNALED(child_status)) {
- DEBUG(10, ("tdb_validate: child terminated by signal %d\n",
- WTERMSIG(child_status)));
-#ifdef WCOREDUMP
- if (WCOREDUMP(child_status)) {
- DEBUGADD(10, ("core dumped\n"));
- }
-#endif
- ret = WTERMSIG(child_status);
- }
- if (WIFSTOPPED(child_status)) {
- DEBUG(10, ("tdb_validate: child was stopped by signal %d\n",
- WSTOPSIG(child_status)));
- ret = WSTOPSIG(child_status);
- }
-
-done:
- DEBUG(5, ("tdb_validate returning code '%d' for tdb '%s'\n", ret,
- tdb_name(tdb)));
-
- return ret;
-}
-
-/*
- * tdb validation function.
- * returns 0 if tdb is ok, != 0 if it isn't.
- * this is a wrapper around the actual validation function that opens and closes
- * the tdb.
- */
-int tdb_validate_open(const char *tdb_path, tdb_validate_data_func validate_fn)
-{
- TDB_CONTEXT *tdb = NULL;
- int ret = 1;
-
- DEBUG(5, ("tdb_validate_open called for tdb '%s'\n", tdb_path));
-
- tdb = tdb_open_log(tdb_path, 0, TDB_DEFAULT, O_RDONLY, 0);
- if (!tdb) {
- DEBUG(1, ("Error opening tdb %s\n", tdb_path));
- return ret;
- }
-
- ret = tdb_validate(tdb, validate_fn);
- tdb_close(tdb);
- return ret;
-}
-
-/*
- * tdb backup function and helpers for tdb_validate wrapper with backup
- * handling.
- */
-
-/* this structure eliminates the need for a global overall status for
- * the traverse-copy */
-struct tdb_copy_data {
- struct tdb_context *dst;
- bool success;
-};
-
-static int traverse_copy_fn(struct tdb_context *tdb, TDB_DATA key,
- TDB_DATA dbuf, void *private_data)
-{
- struct tdb_copy_data *data = (struct tdb_copy_data *)private_data;
-
- if (tdb_store(data->dst, key, dbuf, TDB_INSERT) != 0) {
- DEBUG(4, ("Failed to insert into %s: %s\n", tdb_name(data->dst),
- strerror(errno)));
- data->success = False;
- return 1;
- }
- return 0;
-}
-
-static int tdb_copy(struct tdb_context *src, struct tdb_context *dst)
-{
- struct tdb_copy_data data;
- int count;
-
- data.dst = dst;
- data.success = True;
-
- count = tdb_traverse(src, traverse_copy_fn, (void *)(&data));
- if ((count < 0) || (data.success == False)) {
- return -1;
- }
- return count;
-}
-
-static int tdb_verify_basic(struct tdb_context *tdb)
-{
- return tdb_traverse(tdb, NULL, NULL);
-}
-
-/* this backup function is essentially taken from lib/tdb/tools/tdbbackup.tdb
- */
-static int tdb_backup(TALLOC_CTX *ctx, const char *src_path,
- const char *dst_path, int hash_size)
-{
- struct tdb_context *src_tdb = NULL;
- struct tdb_context *dst_tdb = NULL;
- char *tmp_path = NULL;
- struct stat st;
- int count1, count2;
- int saved_errno = 0;
- int ret = -1;
-
- if (stat(src_path, &st) != 0) {
- DEBUG(3, ("Could not stat '%s': %s\n", src_path,
- strerror(errno)));
- goto done;
- }
-
- /* open old tdb RDWR - so we can lock it */
- src_tdb = tdb_open_log(src_path, 0, TDB_DEFAULT, O_RDWR, 0);
- if (src_tdb == NULL) {
- DEBUG(3, ("Failed to open tdb '%s'\n", src_path));
- goto done;
- }
-
- if (tdb_lockall(src_tdb) != 0) {
- DEBUG(3, ("Failed to lock tdb '%s'\n", src_path));
- goto done;
- }
-
- tmp_path = talloc_asprintf(ctx, "%s%s", dst_path, ".tmp");
- unlink(tmp_path);
- dst_tdb = tdb_open_log(tmp_path,
- hash_size ? hash_size : tdb_hash_size(src_tdb),
- TDB_DEFAULT, O_RDWR | O_CREAT | O_EXCL,
- st.st_mode & 0777);
- if (dst_tdb == NULL) {
- DEBUG(3, ("Error creating tdb '%s': %s\n", tmp_path,
- strerror(errno)));
- saved_errno = errno;
- unlink(tmp_path);
- goto done;
- }
-
- count1 = tdb_copy(src_tdb, dst_tdb);
- if (count1 < 0) {
- DEBUG(3, ("Failed to copy tdb '%s': %s\n", src_path,
- strerror(errno)));
- tdb_close(dst_tdb);
- goto done;
- }
-
- /* reopen ro and do basic verification */
- tdb_close(dst_tdb);
- dst_tdb = tdb_open_log(tmp_path, 0, TDB_DEFAULT, O_RDONLY, 0);
- if (!dst_tdb) {
- DEBUG(3, ("Failed to reopen tdb '%s': %s\n", tmp_path,
- strerror(errno)));
- goto done;
- }
- count2 = tdb_verify_basic(dst_tdb);
- if (count2 != count1) {
- DEBUG(3, ("Failed to verify result of copying tdb '%s'.\n",
- src_path));
- tdb_close(dst_tdb);
- goto done;
- }
-
- DEBUG(10, ("tdb_backup: successfully copied %d entries\n", count1));
-
- /* make sure the new tdb has reached stable storage
- * then rename it to its destination */
- fsync(tdb_fd(dst_tdb));
- tdb_close(dst_tdb);
- unlink(dst_path);
- if (rename(tmp_path, dst_path) != 0) {
- DEBUG(3, ("Failed to rename '%s' to '%s': %s\n",
- tmp_path, dst_path, strerror(errno)));
- goto done;
- }
-
- /* success */
- ret = 0;
-
-done:
- if (src_tdb != NULL) {
- tdb_close(src_tdb);
- }
- if (tmp_path != NULL) {
- unlink(tmp_path);
- TALLOC_FREE(tmp_path);
- }
- if (saved_errno != 0) {
- errno = saved_errno;
- }
- return ret;
-}
-
-static int rename_file_with_suffix(TALLOC_CTX *ctx, const char *path,
- const char *suffix)
-{
- int ret = -1;
- char *dst_path;
-
- dst_path = talloc_asprintf(ctx, "%s%s", path, suffix);
-
- ret = (rename(path, dst_path) != 0);
-
- if (ret == 0) {
- DEBUG(5, ("moved '%s' to '%s'\n", path, dst_path));
- } else if (errno == ENOENT) {
- DEBUG(3, ("file '%s' does not exist - so not moved\n", path));
- ret = 0;
- } else {
- DEBUG(3, ("error renaming %s to %s: %s\n", path, dst_path,
- strerror(errno)));
- }
-
- TALLOC_FREE(dst_path);
- return ret;
-}
-
-/*
- * do a backup of a tdb, moving the destination out of the way first
- */
-static int tdb_backup_with_rotate(TALLOC_CTX *ctx, const char *src_path,
- const char *dst_path, int hash_size,
- const char *rotate_suffix,
- bool retry_norotate_if_nospc,
- bool rename_as_last_resort_if_nospc)
-{
- int ret;
-
- rename_file_with_suffix(ctx, dst_path, rotate_suffix);
-
- ret = tdb_backup(ctx, src_path, dst_path, hash_size);
-
- if (ret != 0) {
- DEBUG(10, ("backup of %s failed: %s\n", src_path, strerror(errno)));
- }
- if ((ret != 0) && (errno == ENOSPC) && retry_norotate_if_nospc)
- {
- char *rotate_path = talloc_asprintf(ctx, "%s%s", dst_path,
- rotate_suffix);
- DEBUG(10, ("backup of %s failed due to lack of space\n",
- src_path));
- DEBUGADD(10, ("trying to free some space by removing rotated "
- "dst %s\n", rotate_path));
- if (unlink(rotate_path) == -1) {
- DEBUG(10, ("unlink of %s failed: %s\n", rotate_path,
- strerror(errno)));
- } else {
- ret = tdb_backup(ctx, src_path, dst_path, hash_size);
- }
- TALLOC_FREE(rotate_path);
- }
-
- if ((ret != 0) && (errno == ENOSPC) && rename_as_last_resort_if_nospc)
- {
- DEBUG(10, ("backup of %s failed due to lack of space\n",
- src_path));
- DEBUGADD(10, ("using 'rename' as a last resort\n"));
- ret = rename(src_path, dst_path);
- }
-
- return ret;
-}
-
-/*
- * validation function with backup handling:
- *
- * - calls tdb_validate
- * - if the tdb is ok, create a backup "name.bak", possibly moving
- * existing backup to name.bak.old,
- * return 0 (success) even if the backup fails
- * - if the tdb is corrupt:
- * - move the tdb to "name.corrupt"
- * - check if there is valid backup.
- * if so, restore the backup.
- * if restore is successful, return 0 (success),
- * - otherwise return -1 (failure)
- */
-int tdb_validate_and_backup(const char *tdb_path,
- tdb_validate_data_func validate_fn)
-{
- int ret = -1;
- const char *backup_suffix = ".bak";
- const char *corrupt_suffix = ".corrupt";
- const char *rotate_suffix = ".old";
- char *tdb_path_backup;
- struct stat st;
- TALLOC_CTX *ctx = NULL;
-
- ctx = talloc_new(NULL);
- if (ctx == NULL) {
- DEBUG(0, ("tdb_validate_and_backup: out of memory\n"));
- goto done;
- }
-
- tdb_path_backup = talloc_asprintf(ctx, "%s%s", tdb_path, backup_suffix);
-
- ret = tdb_validate_open(tdb_path, validate_fn);
-
- if (ret == 0) {
- DEBUG(1, ("tdb '%s' is valid\n", tdb_path));
- ret = tdb_backup_with_rotate(ctx, tdb_path, tdb_path_backup, 0,
- rotate_suffix, True, False);
- if (ret != 0) {
- DEBUG(1, ("Error creating backup of tdb '%s'\n",
- tdb_path));
- /* the actual validation was successful: */
- ret = 0;
- } else {
- DEBUG(1, ("Created backup '%s' of tdb '%s'\n",
- tdb_path_backup, tdb_path));
- }
- } else {
- DEBUG(1, ("tdb '%s' is invalid\n", tdb_path));
-
- ret =stat(tdb_path_backup, &st);
- if (ret != 0) {
- DEBUG(5, ("Could not stat '%s': %s\n", tdb_path_backup,
- strerror(errno)));
- DEBUG(1, ("No backup found.\n"));
- } else {
- DEBUG(1, ("backup '%s' found.\n", tdb_path_backup));
- ret = tdb_validate_open(tdb_path_backup, validate_fn);
- if (ret != 0) {
- DEBUG(1, ("Backup '%s' is invalid.\n",
- tdb_path_backup));
- }
- }
-
- if (ret != 0) {
- int renamed = rename_file_with_suffix(ctx, tdb_path,
- corrupt_suffix);
- if (renamed != 0) {
- DEBUG(1, ("Error moving tdb to '%s%s'\n",
- tdb_path, corrupt_suffix));
- } else {
- DEBUG(1, ("Corrupt tdb stored as '%s%s'\n",
- tdb_path, corrupt_suffix));
- }
- goto done;
- }
-
- DEBUG(1, ("valid backup '%s' found\n", tdb_path_backup));
- ret = tdb_backup_with_rotate(ctx, tdb_path_backup, tdb_path, 0,
- corrupt_suffix, True, True);
- if (ret != 0) {
- DEBUG(1, ("Error restoring backup from '%s'\n",
- tdb_path_backup));
- } else {
- DEBUG(1, ("Restored tdb backup from '%s'\n",
- tdb_path_backup));
- }
- }
-
-done:
- TALLOC_FREE(ctx);
- return ret;
-}
git.samba.org / metze / samba / wip.git / blobdiff